function tt(){  
  v = new Date();
  n = new Date();
  o = new Date();
	bxx = document.getElementById('bxy');
	ss = bxx.title;
	s = ss - Math.round((n.getTime() - v.getTime()) / 1000.);
	m = 0;
	h = 0;
	if (s < 0) {
	  bxx.innerHTML="-";
	} else {
	  if (s > 59) {
      m=Math.floor(s/60);
		  s=s-m*60;
	  }
	  if (m > 59) {
		  h = Math.floor(m/60);
		  m=m-h*60;
	  }
	  if (s < 10) {
		  s="0"+s;
    }
    if (m < 10) {
      m="0"+m;
    }
    bxx.innerHTML = h + ":" + m + ":" + s + "";
  }
  bxx.title = bxx.title - 1;
  window.setTimeout("tt();", 999);
  return;
}
 